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 Workers have been skimming oily water around the clock near Vicksburg, Miss., ever since a barge carrying 80,000 gallons of oil struck a railroad bridge and began leaking before dawn Sunday. The accident forced the closure of a 16-mile stretch of the lower Mississippi, a major inland corridor for vessels carrying oil, Midwest grains, goods and other vital commerce.
A Coast Guard spokesman, Jonathan Lally told The Associated Press by telephone early Tuesday he didn't know when the closed river section might be reopened. On Tuesday morning at least 47 barges and other vessels idled as the river remained closed to traffic eight miles north and eight miles south of Vicksburg.
"The reason why the vessels are being held is the sensitive nature of this work," Lally said. "They are concerned with safety of all those working at the site and any transit in the area could cause a wake, which wouldn't be safe for the crews there."
A tug was pushing two tank barges when the collision occurred about 1:30 a.m. Sunday, authorities said. Both barges were damaged, but only one leaked and authorities subsequently declared the bridge safe after an inspection.
Experts say the stretch of river is one of the most dangerous along the 2,500-mile-long river.
Orange boom has been strung across part of the river downstream from the barge and oil was being pumped from the ruptured tank into another tank on the same barge. Elsewhere another boom was set up as a second line of defense. Officials hope to eventually transfer all the oil to another barge in coming days.
Lally said the oil was being contained and there was no evidence of it washing ashore despite initial reports Sunday of an oily sheen in the area. He added that some oil could be seen lapping up against one of the booms, but it was being held in place.
"We did have a Coast Guard helicopter crew fly for 60 miles up the shoreline there to see if they could spot any environmental impact and they weren't able to find anything," he said, adding a Coast Guard boat surveying 15 miles south of the site also detected nothing. Authorities said a major environmental disaster was unlikely as the swift current dispersed the oil.
Lally said officials were awaiting a recovery plan from the spill's "responsible party."
"Once we get that in hand, we'll get a better estimate of when the river will be reopened," he added.
Tugs were holding the ruptured barge at the bank on the Louisiana side of the river, directly across from Vicksburg's Riverwalk and Lady Luck casinos.
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 Both of the barges involved are owned by Corpus Christi, Texas-based Third Coast Towing LLC, Lt. Gomez said. A woman who answered the phone at the company Monday declined to comment.
Both vessels were being pushed by the tug Nature's Way Endeavor. The website for Nature's Way Marine LLC of Theodore, Ala., identifies the vessel as a 3,000-horsepower, 90-foot-long boat. It was built in 1974 and underwent a rebuild in 2011, according to the company.
A company manager referred calls to the Coast Guard in Vicksburg.
Authorities said United States Environmental Services, an oil spill response company, was collecting oily water.
Officials did not yet have an estimate of how much oil had been pumped out, or how much spilled into the Mississippi.
"There's a list to the barge the way it's sitting. You can't get an accurate reading," said Lally.
But he said the oil was contained and skimmers would work nonstop.
Drew Smith, a hydraulic engineer with the Army Corps of Engineers, wouldn't speculate on the specific cause of Sunday's crash, which is under investigation by the Coast Guard. But he said the Mississippi at Vicksburg is challenging for southbound vessels, mostly barges carrying grain and other products from the nation's heartland.
Southbound tows must travel faster than the flow of the water for their rudders to steer effectively. At Vicksburg they must negotiate a 120-degree turn on the meandering Mississippi, then straighten up to pass under the railroad bridge and the Interstate 20 bridge.
The task is made more difficult by the Yazoo River, which empties into the Mississippi north of the bridges, increasing the speed of the current.
[Associated
Press; By HOLBROOK MOHR]
Associated Press writers Janet McConnaughey in New Orleans and Bill Cormier in Atlanta contributed to this report.
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